Expert system for materials design of PTC thermistors
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This expert system has been developed for helping engineers to design the PTC (Positive Temperature Coefficient) thermistors which are typical electrical ceramics. The engineer presents the composition of a PTC thermistor, and this system predicts the properties, such as switching temperature, resistivity at room temperature, withstanding voltage and density. This system consists of 4 blocks. (1)Composition-input block; Users are required to input the compositions of main constituent elements and typical additives. (2)First(qualitative)-inference block; This block shows the simple inferences, such as “non-conductive”, “high density”. This block is represented by using IF-THEN rules, so the knowledge can be added, removed, and revised very easily. (3)Database-search block. (4)Second(quantitative)-inference block; This block shows the numerical values of the properties. It uses the empirical equations where coefficients are optimized from data by simplex method.